Patents by Inventor Richard J. Farmer

Richard J. Farmer has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Driving circuit for analog-modulated diode-laser
    Patent number: 8971364
    Abstract: A diode-laser is driven by a modulated voltage through a voltage-to-current converter. The modulated voltage has a fixed level determined by an applied fixed bias voltage and a variable level determined by a modulation voltage signal varying between minimum and maximum values. The fixed voltage level corresponds to a threshold level above which the diode-laser would provide laser-output. The modulation voltage signal is monitored and compared with a predetermined set value. If the monitored voltage signal falls below the set value, the modulated voltage is disconnected from the voltage-to-current converter and the output of the diode-laser falls to zero.
    Type: Grant
    Filed: January 19, 2011
    Date of Patent: March 3, 2015
    Assignee: Coherent, Inc.
    Inventors: Gilbert A. Hoffman, Richard J. Farmer
  • DRIVING CIRCUIT FOR ANALOG-MODULATED DIODE-LASER
    Publication number: 20120183005
    Abstract: A diode-laser is driven by a modulated voltage through a voltage-to-current converter. The modulated voltage has a fixed level determined by an applied fixed bias voltage and a variable level determined by a modulation voltage signal varying between minimum and maximum values. The fixed voltage level corresponds to a threshold level above which the diode-laser would provide laser-output. The modulation voltage signal is monitored and compared with a predetermined set value. If the monitored voltage signal falls below the set value, the modulated voltage is disconnected from the voltage-to-current converter and the output of the diode-laser falls to zero.
    Type: Application
    Filed: January 19, 2011
    Publication date: July 19, 2012
    Applicant: Coherent, Inc.
    Inventors: Gilbert A. Hoffman, Richard J. Farmer